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Post by turbominij on Jul 13, 2024 16:29:00 GMT
Little time cutting the meat of out 2 of the eccentric rods today and putting nice curves on the ends with my new bull nosed end mill!!! They are rather rough cuts currently but will clean up easily enough when I’m done No point getting a perfect finish when 50%is being cut away ![](https://uploads.tapatalk-cdn.com/20240713/2cc29e03bbc16d01639d1ac8a07daac9.jpg) ![](https://uploads.tapatalk-cdn.com/20240713/bd64231edb636c4146b6954f7ed4669d.jpg)
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Post by turbominij on Aug 16, 2024 18:20:41 GMT
Spent today drilling and prepping the rods and eccentric straps so I can fit them together have a center spigot in there so they locate properly and always go back in the same spot when the come apart I’m yet to mark them as pairs The need shaping at the far endto to the strap still you can see the intended shap in the scribe lines They also need fettling and tinkering with out but we are getting there with the first two ![](https://uploads.tapatalk-cdn.com/20240816/af5dd011080ec8b227ce20fdf1068851.jpg) ![](https://uploads.tapatalk-cdn.com/20240816/8831c08c6b012720f0b442db8ecfd234.jpg) Popped the frames together today and found the paint has made the crank axle box’s a little snug so crank is a little snug will shave the paint off the horns I think as have a bit of over spray on them home site should have masked them Still trying to get ready for test fitting the eccentric rods so I can rotate the crank ![](https://uploads.tapatalk-cdn.com/20240816/65490c12a9118c499872b6d8b3499676.jpg) Stupidly I fitted the rods upside down and to the wrong straps🤦♂️ double fail!!!! Will refit them tomorrow and split the forks so they can actually be tested still huge steps forward
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Post by turbominij on Aug 22, 2024 18:05:35 GMT
Hi all Popped this part of the valve gear together and I’m worried I’ve got something wrong The valve only moves enough to cover and uncover the rear port it doesn’t move back far enough to uncover the front one. I Don’t want to carry on with the other two rods if somethings wrong with them
I’m thinking it might be the eccentrics are not positioned properly Any tips for roughly setting them just to prove things are close enough to being right
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Post by chris vine on Aug 22, 2024 19:55:19 GMT
Whatever is wrong or right, the movement should be approx symmetrical about the ports. Can you adjust the position of the valve on its rod to achieve this?? Chris
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Post by turbominij on Aug 22, 2024 20:14:07 GMT
No there is no adjustment left in the rods or linkage so I’m thinking they might be to long or threaded bit is not long enough
The rods are not a part I made they already existed when I brought it and haven’t checked the lengths thinking about it so probably a good idea
il measure them tomorrow and confirm they are correct as per drawings this could account for them only uncovering the rear and the front not being seen I guess the other thing is the valves being too fat again I haven’t checked the measurements on them
So long as rods are both the same length(not adjusted) The ports would only be even if the eccentrics were places 180 apart otherwise they wouldent be even I’m right in saying yes?
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Post by turbominij on Aug 23, 2024 15:50:08 GMT
Ok so a bit of working out testing lengths of thing and setting the eccentric discs so they are opposite each other and progress I can get the valve to sit in the middle and evenly open ports but they don’t open them very much.
How much of the port should be open ? At the end of each stroke?
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Post by turbominij on Aug 24, 2024 18:13:46 GMT
After hitting problems testing things yesterday with insufficient valve movement I set about today to try and improve things The improvements came from finishing making the lift links and fitting them to the reverser shaft in doing so I noticed it was moving as the crank was rotated meaning it was all binding so……… Opened up the expansion link ends by squaring them off so the dies would move all the way to the end Rounded the die block spaces to give some more room Rounded and shaped the rods as it turns out the bell shape at the end is critical for clearance at the full forward and full revers of the valve gear The net result of all the fettling is And have made massive improvements i previously only had the ports cracking open i now have the ports half open on each end of the movement with adjustment available to time it later if needed Still got some more work to do to get it fitting nicer but this morning it wouldn’t have worked and I was worried I done something wrong now it looks like it will work and things can only improve Proper chuffed with that improvement !! ![](https://uploads.tapatalk-cdn.com/20240824/7ec66cb56160820be7cdcab29d79af92.jpg) ![](https://uploads.tapatalk-cdn.com/20240824/d2dacf07694a87684749610317672c4f.jpg) ![](https://uploads.tapatalk-cdn.com/20240824/e69c9aec17855adfecb3f86296fcf814.jpg) Yes I no the expansion link straps are upside down it’s because I have no grub screws in #4 eccentric currently as it looks rough so I have ordered some new ones So I’m using 1 and 2 for my testing.
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